Syntheses and characterization of zeolites K-F and W type using a diatomite precursor

2014 ◽  
Vol 78 (5) ◽  
pp. 1209-1225 ◽  
Author(s):  
D. Novembre ◽  
C. Pace ◽  
D. Gimeno
Keyword(s):  
Potassium Hydroxide ◽  
Rietveld Method ◽  
Morphological Characterization ◽  
Raw Material ◽  
Quantitative Phase Analysis ◽  
Cell Parameters ◽  
Chemical Treatments ◽  
Natural Rock

AbstractZeolites K-F and W (EDI and MER types) were synthesized hydrothermally using a natural rock as raw material. Chemical treatments were carried out on a diatomitic rock (containing opaline silica) from Crotone (Calabria, Italy) in order to separate/obtain potassium silicate, a reagent necessary for synthesizing zeolites. Synthesis experiments were performed by mixing the obtained siliceous solution with potassium hydroxide and alumina in varying proportions at 150°C and room pressure. Four synthesis series were performed to form zeolite K-F (EDI) and zeolite W (MER).The chemical-physical and morphological characterization of the zeolite phases were carried out. Cell parameters were calculated using the Rietveld method. Infrared, thermal and nuclear magnetic resonance (29Si) experiments confirmed the high quality of the zeolite products. The amorphous phase in the synthesis powders was estimated with quantitative phase analysis using the combined Rietveld and reference intensity ratio methods.

scholarly journals Synthesis and characterization of wollastonite-2Mby using a diatomite precursor

2018 ◽  
Vol 82 (1) ◽  
pp. 95-110 ◽  
Author(s):  
Daniela Novembre ◽  
Carla Pace ◽  
Domingo Gimeno
Keyword(s):  
Solid Phase ◽  
Ambient Pressure ◽  
Quantitative Phase Analysis ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
Chemical Treatments ◽  
Natural Rock ◽  
Reactive Silica ◽  
Data Estimation

ABSTRACTSolid phase reaction synthesis of wollastonite-2Mby a natural rock precursor as the source of amorphous silica and CaCO3is reported. Chemical treatments were carried out on a diatomitic rock from Crotone (Calabria, Italy) in order to measure its reactive silica and CaCO3contents. Four series of synthesis were performed at 1000°C at ambient pressure by mixing, at different stoichiometry, the diatomitic rock with a natural limestone as a source of additive CaCO3, and sodium carbonate (Na2CO3) as triggering agent.Wollastonite-2Mwas characterized by chemo-physical, crystallographical and morphological-microtextural analyses. All these characterizations, together with infrared and nuclear magnetic resonance (29Si) responses provide values comparable to literature data. Estimation of the amorphous phase in the synthesis powders was performed through quantitative phase analysis using the combined Rietveld and reference intensity ratio methods, resulting in a final product of 96.3% wollastonite-2M.

scholarly journals Evolution and characterization of eggshell as a potential candidate of raw material

Cerâmica ◽  
2018 ◽  
Vol 64 (370) ◽  
pp. 236-241 ◽  
Author(s):  
T. Zaman ◽  
Mst. S. Mostari ◽  
Md. A. Al Mahmood ◽  
Md. S. Rahman
Keyword(s):  
Soil Stabilization ◽  
Physical Property ◽  
Morphological Characterization ◽  
Raw Material ◽  
Quantitative Phase Analysis ◽  
Potential Candidate ◽  
Good Source ◽  
Property Estimation ◽  
Potential Source

Abstract Characterization of both uncalcined and calcined eggshells was done in this work. Raw eggshells turned out as a good source of calcite phase. Calcined eggshells had a mixture of lime and portlandite phase. A significant impact of calcination temperature on the percentage of generated phases was observed. Qualitative as well as semi-quantitative phase analysis, morphological characterization and physical property estimation was done for the produced powder. The influence of synthesized raw material on soil stabilization and biomaterial formation was further assessed. The eggshell turned out as a potential source of raw material for various sectors.

scholarly journals A Methodology Based on FT-IR Data Combined with Random Forest Model to Generate Spectralprints for the Characterization of High-Quality Vinegars

Foods ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1411
Author(s):  
José Luis P. Calle ◽  
Marta Ferreiro-González ◽  
Ana Ruiz-Rodríguez ◽  
Gerardo F. Barbero ◽  
José Á. Álvarez ◽  
...  
Keyword(s):  
Random Forest ◽  
Raw Materials ◽  
Principal Component ◽  
Hierarchical Cluster ◽  
Raw Material ◽  
Support Vector ◽  
Protected Designation Of Origin ◽  
Ft Ir

Sherry wine vinegar is a Spanish gourmet product under Protected Designation of Origin (PDO). Before a vinegar can be labeled as Sherry vinegar, the product must meet certain requirements as established by its PDO, which, in this case, means that it has been produced following the traditional solera and criadera ageing system. The quality of the vinegar is determined by many factors such as the raw material, the acetification process or the aging system. For this reason, mainly producers, but also consumers, would benefit from the employment of effective analytical tools that allow precisely determining the origin and quality of vinegar. In the present study, a total of 48 Sherry vinegar samples manufactured from three different starting wines (Palomino Fino, Moscatel, and Pedro Ximénez wine) were analyzed by Fourier-transform infrared (FT-IR) spectroscopy. The spectroscopic data were combined with unsupervised exploratory techniques such as hierarchical cluster analysis (HCA) and principal component analysis (PCA), as well as other nonparametric supervised techniques, namely, support vector machine (SVM) and random forest (RF), for the characterization of the samples. The HCA and PCA results present a clear grouping trend of the vinegar samples according to their raw materials. SVM in combination with leave-one-out cross-validation (LOOCV) successfully classified 100% of the samples, according to the type of wine used for their production. The RF method allowed selecting the most important variables to develop the characteristic fingerprint (“spectralprint”) of the vinegar samples according to their starting wine. Furthermore, the RF model reached 100% accuracy for both LOOCV and out-of-bag (OOB) sets.

scholarly journals Synthesis and characterization of analcime (ANA) zeolite using a kaolinitic rock

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Daniela Novembre ◽  
Domingo Gimeno
Keyword(s):  
Ambient Pressure ◽  
Added Value ◽  
Emission Spectrometry ◽  
Quantitative Phase Analysis ◽  
Crystallization Time ◽  
Experimental Protocol ◽  
Economic Point ◽  
Cell Parameters ◽  
Synthesis Protocol

AbstractAnalcime is nowadays an important component in dental porcelain systems, in heterogeneous catalysis, in the nanoelectronic field, in selective adsorption and in stomatology (dental filling and prosthesis). Analcime synthesis from an impure, silica-rich kaolinite rock coming from Romana (Sassari, Italy) is here presented. A synthesis protocol is proposed that aims to make an improvement of synthesis conditions compared to the past. The hydrothermal treatment is in fact here achieved without aging times and without the use of sodium silicate or other additional silica source reported in the literature. Lower calcination temperature, synthesis temperature and crystallization time are verified in this work. The kaolin is subjected to calcination at the temperature of 650 °C and then mixed with NaOH. The experiment is performed at ambient pressure and 170 ± 0.1 °C. The degree of purity of analcime is calculated in 97.57% at 10 h. Analcime is characterized by X-ray diffraction, infrared spectroscopy, scanning electron microscopy, inductively coupled plasma optical emission spectrometry and thermal analysis. Density is also calculated. Cell parameters and the amount of amorphous phase in the synthesis powders is estimated with quantitative phase analysis using the combined Rietveld and reference intensity ratio methods. The experimental conditions make the synthesis protocol particularly attractive from an economic point of view. Also this work does not use a commercial kaolin but silica-rich impure kaolinitic rock from a disused quarry. This further reduces the costs of the experimental protocol. It also gives the protocol an added value, as the synthesis of a useful mineral is obtained through the valorization of an otherwise unused georesource. Both chemical and physical characterization of analcime is satisfactory making the experimental protocol very promising for an industrial transfer.

scholarly journals Crystallization, optimization and preliminary X-ray characterization of a metal-dependent PI-PLC fromStreptomyces antibioticus

2012 ◽  
Vol 68 (11) ◽  
pp. 1378-1386 ◽  
Author(s):  
Michael R. Jackson ◽  
Thomas L. Selby
Keyword(s):  
X Ray Diffraction ◽  
Hanging Drop ◽  
Orthorhombic Space Group ◽  
X Ray ◽  
Streptomyces Antibioticus ◽  
Cell Parameters ◽  
Heavy Atoms ◽  
Hanging Drop Method

A recombinant metal-dependent phosphatidylinositol-specific phospholipase C (PI-PLC) fromStreptomyces antibioticushas been crystallized by the hanging-drop method with and without heavy metals. The native crystals belonged to the orthorhombic space groupP222, with unit-cell parametersa= 41.26,b= 51.86,c = 154.78 Å. The X-ray diffraction results showed significant differences in the crystal quality of samples soaked with heavy atoms. Additionally, drop pinning, which increases the surface area of the drops, was also used to improve crystal growth and quality. The combination of heavy-metal soaks and drop pinning was found to be critical for producing high-quality crystals that diffracted to 1.23 Å resolution.

scholarly journals Structural Properties Analysis of Mg-β-TCP by X-ray Powder Diffraction with the Rietveld Refinement

2020 ◽  
Vol 9 (4) ◽  
pp. 1562-1568
Keyword(s):  
Powder Diffraction ◽  
Rietveld Method ◽  
Quantitative Phase Analysis ◽  
Structural Refinement ◽  
Osteoporosis Therapy ◽  
X Ray ◽  
Cell Parameters ◽  
Biomineralization Process ◽  
Resultant Powder ◽  
Rapid Reaction

The incorporation of magnesium in the synthetic apatite has been associated with the biomineralization process and osteoporosis therapy in humans and animals. β-tricalcium phosphate (β-TCP) is one of the most common bioceramics widely applied in bone cement and implants. In this work, Ca-deficient apatite (CDA) with a theoretical 0.08 Mg/(Ca+Mg) ratio was synthesized by the rapid reaction between Ca(OH)2, MgCl2.6H2O and H3PO4 at 40°C and the resultant powder calcined at 650 °C for 10h. X-ray powder diffraction analysis (XRD), in combination with the Rietveld method (Fullprof-suite), was employed for quantitative phase analysis and structural refinement. The results of XRD indicate that magnesium can substitute for calcium into a β-TCP structure inducing a reduction of the cell parameters and the compound crystallizes in the rhombohedral R3c structure, with the following unit cell constants: a = b = 10.3560 Å, c = 37.1718 Å, and cell volume V = 3452.44. The analysis indicated that the substitution of Mg2+ on the M(4) and M(5) sites were, approximately, 2.61 and 6.97 mol%, corresponding to the Ca2.72(MgIV0.07, MgV0.21)(PO4)2 stoichiometric formula and 0.09 Mg/(Ca+Mg) ratio.

QUALIDADE DO CALDO PARA PRODUÇÃO DE ETANOL EM CULTIVARES DE SORGO SACARINO SOB ADUBAÇÃO NITROGENADA

2017 ◽  
Vol 16 (3) ◽  
pp. 388
Author(s):  
CRISTÓBAL SOTO SOLANO ◽  
NIRALDO JOSÉ PONCIANO ◽  
ROGÉRIO FIGUEIREDO DAHER ◽  
RAFAEL AUGUSTO DA COSTA ◽  
PAULO MARCELO DE SOUZA ◽  
...  
Keyword(s):  
Ethanol Production ◽  
Nitrogen Fertilization ◽  
Ethanol Yield ◽  
Raw Materials ◽  
Raw Material ◽  
Maximum Value ◽  
Total Reducing Sugars ◽  
Nitrogen Rates

 RESUMO - O sorgo sacarino tem potencial de uso como fonte de matéria-prima para a produção de bioetanol. Objetivou-se, com este estudo, analisar o efeito da adubação nitrogenada de cobertura na qualidade do caldo para produção de etanol de quatro cultivares de sorgo sacarino. O experimento foi conduzido em Campos dos Goytacazes- RJ, de janeiro a maio de 2014. Foram estudadas quatro cultivares de sorgo sacarino: BRS 506, BRS 508, BRS 509 e BRS 511 e cinco de doses de nitrogênio (0, 80, 160, 240 e 320 Kg ha-1), aplicadas aos 25 e 45 dias após semeadura. Os resultados mostraram que valor Brix, açúcares redutores totais, açúcares totais recuperáveis, volume do caldo e rendimento de etanol foram afetados pela adubação nitrogenada. Para todas as características, o valor máximo foi obtido pela dose de 240 kg de N ha-1. Entre as cultivares, a BRS 506 mostrou-se superior em produção de caldo e rendimento de etanol. Enquanto a BRS 511 destacou-se nos atributos ART e ATR, e a cultivar BRS 508 sobressaiu-se no valor Brix. A cultivar BRS 506 apresentou melhor resultado combinado, com maior volume de caldo e rendimento de etanol com as doses de 204 e 212 kg N ha-1, respectivamente. Palavras-chave: biocombustíveis, rendimento de álcool carburante, atributos industriais, caracterização da matéria prima, genótipos. QUALITY OF BROTH FOR ETHANOL PRODUCTION IN CULTIVARS OF SACARINE SORGHUM UNDER NITROGEN FERTILIZATION  ABSTRACT - Sweet sorghum has potential as a source of raw material for the production of bioethanol. The objective of this study was to analyze the effect of nitrogen topdressing on the quality of the juice for ethanol production from four cultivars of sorghum. The experiment was conducted in Campos, State of Rio de Janeiro, Brazil, from January to May 2014. Four cultivars of sorghum: BRS 506, BRS 508, BRS 509 and BRS 511 were studied, and five nitrogen rates (0, 80, 160, 240 and 320 kg ha-1), applied to 25 and 45 days after sowing. The results showed that the value Brix, total reducing sugars, total recoverable sugars, broth volume and ethanol yield were affected by nitrogen fertilization. For all features, the maximum value was obtained for the dose of 240 kg N ha-1. Among cultivars, BRS 506 was superior in production of broth and ethanol yield. BRS 511 stood out in the attributes ART and ATR, and BRS 508, in value Brix. BRS 506 had better combined result of higher volume of juice and ethanol yield with doses of 204 and 212 kg N ha-1, respectively Keywords: biofuels, fuel ethanol output, industrial attributes, characterization of raw materials, genotypes.   

scholarly journals SIFAT FUNGSIONAL SEMI REFINED CARRAGEENAN (SRC) DARI RUMPUT LAUT EUCHEUMA COTTONII ASAL KABUPATEN SANGIHE

2020 ◽  
Vol 6 (1) ◽  
pp. 31-36
Author(s):  
Obyn Pumpente ◽  
Jaka Frianto Putra Palawe
Keyword(s):  
Functional Properties ◽  
Potassium Hydroxide ◽  
Gel Strength ◽  
Raw Material ◽  
Added Value ◽  
Economic Potential ◽  
Sulfate Content ◽  
Eucheuma Cottonii

Rumput  laut merupakan  salah  satu  komoditas  unggulan  sektor  perikanan  karena  permintaan  yang  terus meningkat untuk kebutuhan dalam negeri maupun untuk ekspor. Untuk  meningkatkan  nilai  tambah  dan  harga  jual, maka pengolahan rumput laut menjadi  produk  karaginan  perlu  dilakukan. Tetapi meskipun rumpu laut cukup melimpah di Kabupate Sangihe, sejauh  ini  belum  ada penelitian  mengenai  kualitas  tepung  karaginan  yang diolah  dari  rumput  laut  asal  pesisir  Kabupaten Kepulauan Sangihe.  Tujuan  penelitian  ini  adalah  untuk mendapatkan  konsentrasi  KOH  yang  menghasilkan  karaginan  terbaik  dan  mengkarakterisasi  sifat  fungsional  karagi­nan  rumput laut  Eucheuma cottonii  asal  Kampung Bulo, Kecamatan Tabukan Selatan, Kabu­paten Kepulauan Sangihe sedangkan manfaat  dari  penelitian  ini dapat memberikan informasi tentang prospek pengembangan  usaha  budidaya  rumput  laut di Kabupaten Kepulauan Sangihe dan  prospek usaha  karaginan  sebagai  bahan  baku berbagai industri.  Metode Penelitian ini merupakan penelitian deskriptif, dengan mengamati sifat fungsional  dari pesisir Kabupaten Kepulauan Sangihe, prosedur penelitian dilakukan menggunakan dua tahap yaitu pada tahap pertama pengolahan SRC dengan perlakuan konsentrasi potasium hidroksida 4%, 6%, 8% dan 10%, suhu 80°C dan waktu proses 2 jam, tahap kedua yakni analisis sifat fungional dan rendemen. Penggunaan kalium hidroksida pada proses pembuatan SRC telah memenuhi standar mutu. Kisaran nilai rendemen sebesar 48.49-52.04%, nilai kekuatan gel yakni sebesar 279.59-394.22g/cm2, nilai viskositas didapatkan sebesar 22.08-35.79 cP, nilai kadar sulfat berkisar 18.13-25.43%. Nilai sifat fungsional SRC dari rumput laut  Eucheuma cottonii  asal  Kampung Bulo, Kecamatan Tabukan Selatan, Kabupaten Kepulauan Sangihe memenuhi standar yang ditetapkan oleh FAO dan BSN.   Seaweed is one of the promising fisheries commodities because of its increasing de­mand for both domestic and export needs. To increase added value and price, it is necessary to process seaweed into carrageenan products. However, despite the economic potential of carrageenan and the abundance of seaweed in Sangihe Islands, no research has addressed the quality of carrageenan from seaweed of this region. This study aimed to obtain the best KOH concentration for producing the best carrageenan from Euchema cottonii of Bulo village Nusa Tabukan district Sangihe Islands and to characterize its carrageenan functional properties. The benefit of this research included to provide information regarding the prospects of developing sea­weed cultivation in the regency and semi refined carrageenan (SRC) supply as raw material for various industries. The functional properties of semi SRC were determined by using two step analyses. First, SRC was treated with different concentration of potassium hydroxide (4%, 6%, 8% and 10%) KOH at 80°C and for 2 hours. Then, it was followed by analysis of SRC’s functional properties and yields. The results showed yield of 48.49 to 52.04%, gel strength of 279.59-394.22g /cm2, viscosity of 22.08-35.79 cP and sulfate content of 18.13-25.43%. These SRC’s functional properties of E. cottonii from Sangihe Is­lands Regency and the KOH concentration used in this study met the standards set by FAO and BSN.

scholarly journals Synthesis and characterization of Na-P1 (GIS) zeolite using a kaolinitic rock

2020 ◽  
Author(s):  
Daniela Novembre ◽  
Domingo Gimeno ◽  
Alessandro Del Vecchio
Keyword(s):  
Inductively Coupled Plasma ◽  
Rietveld Method ◽  
Ambient Pressure ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
Quantitative Phase Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cell Parameters ◽  
Inductively Coupled

Abstract This work focuses on the hydrothermal synthesis of Na-P1 zeolite by using a kaolinite rock coming from Romana (Sassari, Italy). The kaolin is calcined at a temperature of 650 °C and then mixed with calculated quantities of NaOH. The synthesis runs are carried out at ambient pressure and at variable temperatures of 65 ° and 100 °C. For the first time compared to the past, the Na-P1 zeolite is synthesized without the use of additives and through a protocol that reduces both temperatures and synthesis times. The synthesis products are analysed by X-ray diffraction, high temperature X-ray diffraction, infrared spectroscopy, scanning electron microscopy and inductively coupled plasma optical emission spectrometry. The cell parameters are calculated using the Rietveld method. Density and specific surface area are also calculated. The absence of amorphous phases and impurities in synthetic powders is verified through quantitative phase analysis using the combined Rietveld and reference intensity ratio methods.The results make the experimental protocol very promising for an industrial transfer.

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